Eccentric miller



Sept. 15, 1936. E. G. ROEHM 2,054,168

ECCENTRIC MILLER Filed Jan. 22, 1955 8 Sheets-Sheet 4 IN VEN TOR.

ATTORNEY.

Sept. 15, 1936. E. G. ROEHM 2,054,168

ECCENTRIC MILLER Filed Jan; 22, 1935 8 Sheets$heet 5 10 INVENTOR.

fPM/Y 5%54/1 5 WWW ATTORNEY.

Sept. 15, 193

e. ROEHM 2,054,168

ECCENTRIC MILLER Filed Jan. 22, 1935 8 Sheets$heet 7 ATTORNEY.

Sept. 15, 1936.

E. G. ROEHM ECCENTRIC MILLER Filed Jan. 22, 1935 8 Sheets-Sheet 8 ATTORNEY.

Patented Sept. 15, 1936 UNlTED STATES, PATENT] "OFFICE ECCENTRIC MILLER Erwin G. Roehm, Norwood, Ohio, assignor to The Cincinnati Milling Machine (20., Cincinnati, Ohio, a corporation of Ohio Application January 22, 1335, Serial No. 2,967

1c Claims. (01. 90 15) This invention relates to milling machines and nism for operating the cross slide as viewed on more particularly to an improved machine for the line Ill-l of Figure 9.

milling annular grooves in work piecesl Figure 11 is a detail viewtaken on the line.

One of the objects of this invention is to proll-H of Figure 6. .5 vide a complete automatic machine for milling Figure 12 is a detail view on the line l2-l2 internalannular grooves in work pieces. of Figure 6. g

Another object of this invention is to provide Figure 13 is a plan view of a modified form of a mechanism for the purposes set forth in which the invention. the various positioning movements maybe ef- Figure 14 is an enlargedview of a portion of fected hydraulically and thereby ina' minimum Figure 8 with the parts shown in'a different po- 10 of operating time. sition.

A further object of this invention is to, provide Figures 15 and 16 are views showing different a machine forthe purposes set forth in which positions of the spindle clutch'control mechaall of the movements, either positioning or opernism.

15 ating, are imparted to the cutter whereby an- Figure 1'7 is a detail view of the by-pass valve 15 nular grooves may be formed in work pieces operating mechanism. which are not of suitable shape or size for ,im- Figure 18 is a diagram of .the hydraulic cirparting rotation thereto. cuit of the machine. A

An additional object of this invention is'to pro- Figure 19 is a detail view of'the carrier trip v 20 vide a machine of the character described -in mechanism shown inFigure l3.

- which certain interlocks are provided to improve The machine embodying the principles of this the safety of operation of the machine as a whole. invention and shown in Figures ,1 and 2 of the Other objects and advantages of the present drawings, comprises a bed 20 haying a fixed work invention should be readily apparent by refersupport 2| mounted thereon for receiving a work ence to the following specification, considered piece, such as 22, which may be securely clamped 25 in conjunction with the accompanying drawings to the work support by suitable means dependforming a part thereof and it is to be understood ing upon the sizeand shape of the work, and I that any modifications may be made in the exact in the present instance comprising a pair or upstructural details there shown and described, right clamping bolts 23 and a cross strap 24.

within the scope of the appended claims, without Suitable positioning means may be provided, de- 30 departing from or exceeding the spirit of the inpending upon the character of the work and the vention. number and position of locating surfaces or holes Referring to the drawings in which like refertherein. ence numerals indicate like or similar parts: It will be noted that the work table 2| is Figure 1 ls a side elevation of a machine em-v adapted to receive various sizes ,of work which 35 bodying the principles'of this invention. are impossible of mounting in a rotatable chuck. Figure'2 is aplan view of the machine shown This is made possible by so constructing the in Figure 1. machine that all of the positioning and operat- Figure 3 is a vertical section through the gear ing movements are imparted to the tool. 40 box taken on the line 33 or .Figure 1. The cutter spindle 25 shown in Figure" 1, which 40 Figure 4 is a horizontal section on the line has the cutter 26 secured to the end thereof, is 4-,-4 of Figure 3. journaled in anti-friction bearings 26', as more Figure5isahorizontal section on the line 5-5 particularly shown in Figure 4, which are in l of Figure 3. w turn supported eccentrically in the rotatable Figure 6 is avertical section as viewed on the head 21. The head, in turn, is journaled in a 45 line 66 of Figure 1. I, large bearing 28. This bearing is carried by cross Figure '7 is a detail section on the line' 1-'-! slide 29, which in turn is movable with a horiof Figure 6, showing the slide operating mecha zontal-reciprocable slide 3|], the slide 30 being nism. movable toward and from the work table 2|. 7 Figure 8 is a plan view, partly in section, as Briefly, the automatic. cycle of operation or 50 viewed onthe line 88 of Figure 1. the machine .is' to advance the reciprocable slide Figure 9 is an enlarged detail view of a por- 30 toward the work table'2l so as to insert the tion of the operating mechanism as viewed on the cutter 26 into a bore, such as 3|, of the work line 99 of Figure 6. piece in which bore the annular groove, such as l Figure 10 is a detail view of the trip mecha- 32, is to be formed. The cross slide is then moved I I plates 34 to a drive pulley 35 secured to the end i of shaft :6. This shaft, as shown in'Figure 3,

. tatlng also.

has a pinion 31 keyed thereto in meshwith a large gear 38 fixed to the end of shaft 39 asmore particularly shown in Figure 4. The shaft 39 rotates the outer member 48 of a multiple disc friction clutch 4| which is adapted to connect the member 48 to shaft 4|, carrying gear 42. The clutch is engaged and disengaged by a shifter spool 43 which is moved back and forth by a shifter fork 44 fixed with operating shaft 45. When the clutch is engaged, pinion 42 rotates shaft 46 through gear '41, the shaft 45 having fixed on one end'a gear 48 which intermeshes with an internal .gear 49 keyed to the end of shaft 25. The position and size of gear 48 and the internal gear 49 are such as to maintain a driving relation between them throughout a complete rotation of the head 21. From this it will be seen that a very simple transmission has been provided for rotation of the spindle and that this rotation may be controlled by the fricj tion clutch 4|.

The rotary head21 is also driven from the prime mover 33 but is subject to control by the spindle clutch 4| in such a way that the head 21 cannot be rotated unless the cutter spindle is ro- This is accomplished by connecting the branch transmission for rotation of the head 21 to the shaft 48, which in turn is controlled by the friction clutch. This shaft, as shown in Figure 4, has a gear 58 fixed to one'end thereof which is connected by a gear train comprising the small gear 5| in mesh with gear 58, and a gear 52 co-axial with gear 5| and fixed therewith, to a pinion 53 fixed to the end of shaft as more particularly shown in Figure 5. The

. shaft 54 drives a sleeve 55 upon the end of which the periphery of the rotary head 21, as shown in Figure 4. These two worm reductions in series provide for-a very slow. rate of-rotation of. the rotary head in spite of :the fact that they are driven from the high speed spindle transmission.

These reductions alsoprovide a very powerful drive for effecting relative movement between the cutter and work. r

' The clutch member 51. is moved .into and out of a driving position by a shifter fork 64 fixed to the end of control shaft 65. It will now be seen that when the cutter spindle transmission is being operated, that the branch transmission to the rotary head is also operating, but selective 75 the'rotation of the cutter spindle. The mechameans are provided whereby the rotary head may be disconnected at any time without disturbing ,tive stop 12.

and from the work support.

nism for moving the horizontal slide 38 toward and from the work support is more particularly shown in Figure 7 and comprises a rack 86 which is adjustably secured to the under side of the slide and may be adjusted by the screw 61 which is threaded in a bore 38 formed in the end of the rack member, the screw having a squared operating end 69- and a graduated dial 10 associated therewith. The screw is fixed against axial movement so that rotation thereof will effect axial movement of the rack. The purposeof this micrometer adjustment isto determine the position of the cutter with respect .to the work and to this end the end 1| of thegrack bar is'reduced in/diameter to form a support for the end of the rack bar and an abutment for engaging the posi- This positive stop is a threaded member mounted ina fixed part of the bed.

Reciprocation is effected by a gear sector 13 keyed to ,shaft 14 interengaging with the rack teeth 66. The shaft 14 projects through the front wall of the bed into the control box 15, as more particularly shown-in Figure 1, where it is provided with a bifurcated operating arm 16. It will now be seen that oscillation of this arm will efiect movement of the slide 38 toward The cross slide 29 is movedby the mechanism shown in Figures 9 and 10 and comprises a rack bar 11 fixed to the slide 29 and a pinion 18 fixed to shaft 19fjournaled in the bracket 88 which is integral with the slide 38. The bracket 88 projects through an opening 8| formed in the top of the control box and the lower end of the shaft,which projects beyond the bracket, is provided with a pair of crank arms 82 in the end of each of which is mounted a roller 83. to be alternately engaged by a dog 84 which constitutes the means for rotating shaft-19 and pinion 18 and thereby reciprocation of the rack 11 and slide 29.

, The engagement and disengagement of the control clutches and the movements of the slides are all efiected in a predetermined sequence and in timed relation with the reciprocation of a control piston rod 85 and connected slide 86. The piston rod, as shown in Figure 1, extends into a cylinder 81 which has a contained piston 88 fixed to the end of the piston rod.

Admission of fluid pressure to the cylinder is controlled by the valve 89, Figures 9 and 18, which has a pressure port 98 connected by a supply pipe 9| to pump 92, which is rotated by electric motor 93. The pump has an intake pipe 94 through which the pump withdraws fluid from a reservoir 95 formed in the bed of the machine. The pipe 9| may also have a relief valve 95 therein connected by a pipe 91'to the reservoir for returning excess connected to reservoir. The valve plunger I84 which controls these connections has only two These rollers are adapted pressure, the other end of the cylinder may be positions, and a spring pressed detent I85, alternately engageable with indents I85 and I81 formed in the plunger, serves to hold the plunger in either one of these two positions. The upper end of the plunger has an elongated slot I88 cut therein which interfits in an elongated slot I89 formed in the side of the plunger II8. A certain compression of spring. I3'I.

amount of lost motion is provided in this connection whereby plunger IIO may be given a certain amount of movement before the valve is shifted. The valve is moved upward to the position shown in Figure 9 by the'manual control lever 0' which, as shown in Figure 1, is fixed on the end of shaft III, this shaft extending into the control box and provided with a lever II2 which has a ball-shaped end II3 fitting in a slot II4 formed in the side of plunger H0. The lever 0' has three positions represented by the three dash and dot lines in Figure 1, and upon starting the machine the lever is moved to its extreme upper position. In moving to this position it first takes up the lost motion between plunger H0 and the valve plunger for purposes to be described later and then moves the valve plunger upward to the position shown in Figure 9. After the machine has started, the lever is moved to its intermediate position which places the plunger I I0 in the position shown in Figure 9 so that upon downward movement of plunger I I 0, by automatic means to be described later, the valve plunger I04 may be immediately shifted downward to effect reverse movement of piston 88. This intermediate position of control lever I I0 is called the running position.

The machine is reversed by the firing of a. spring loaded mechanism indicated generally by the reference numeral H5 in' Figure 8 and one of the functions of the lever H0 is to reload this spring mechanism at the beginning of a cycle of operation and also to engage thespindle control clutch 4I. These functions are effected by a lever II6 which is operatively connected to the plunger IIO by the following mechanism.

As shown in Figures 6 and 11 the plunger .0 has rack teeth In formed on the upper end thereof which intermesh with a pinion II3 keyed to the end of shaft II9. This shaft is splined in a bevel gear I journaled in a bracket I 2I which is carried by the horizontal slide 30. This bevel gear meshes with a second bevel gear I22 fixed to the end of a spline shaft I23 for rotation of bevel gear I24 journaled in a bracket I25 carried by the cross slide 29.

As shown in Figure 6, the bevel gear- I 24 meshes with a bevel gear I 26, fixed to the lower end of the vertical shaft I2'I which has a pinion I28 fixed to the upper end thereof, as shown in Figure 8. This pinion meshes with rack teeth I29 formed onvthe shifter rod I30, the shifter rod having a slot I3I formed in the opposite end for receiving the ball-shaped end I32 of lever II6.

When the control lever H0 is moved to its extreme upper positionit effects axial movement of shift'er rod I from the position shown in Figure 14 toward the left as viewed in Figure 8, whereupon the end I33 of lever H6 is moved toward the right to shift the plunger I34 and reload the spring operated mechanism I I5. This movement is sufiicient to permit the spring pressed latch lever I35 to engage a shoulder I36 formed on the member I34 and hold the member in the position shown in Figure 8 against the Also, during the movement of reloading the spring mechanism a lug I38 projecting frdm lever I33 engages a shoulder 1.39 on lever I40 to rotate this lever in a clockwise direction as viewed in Figure 8 and thereby, through the shaft to which it is keyed, effect engagement of the spindle clutch shown in Figure 4.

During the latter part of the movement of lever I33 the valve I04 is shifted, which admits preson and the fixed abutment sure to the right hand end of cylinder 01 to thereby cause movement of slide 86 to'the left as viewed in Figure 1, this slide automatically ,controlling the sequence of'movements of the remaining parts of the machine. When this begins, the operator moves the lever I I0 back to its intermediate position which thereby. causes-movement of rod I30, Figure 8, and lever I33 to the position shown in Figure 8. I

' As the slide 86 moves toward the left a roller I4I engages the bifurcated lever I6 and eifects rotation thereof in a clockwise direction, as

viewed in Figure l, and thereby through the mechanism shown and described in" Figure 7, ad-

'vances the slide 30 toward the worksupport 2|,

inserting the cutter 26 in the bore 3| of the work 'piece. Simultaneously, with abutment of the member II with the positive stop I2 a locking member I42 is snapped into position by a spring I43shown in Figure 6. This spring has one end attached to a pin I44'fixed in the locking member I42 and the other end attached to a fixed part of the bed. This locks the slide 30 in its forward position and advances the bracket 80 to the position shown in Figure 9 for engagement of the dog 84, Figure 10, with one of the rollers 83 to effect rotation of shaft I9. The dog 84 is carried on the upper end of a plate I45 secured as by a plurality of screws I46 to the slide 86. Clockwise rotation of shaft I9, as viewed in Figure 10,

direction away from the operator and sinking of the cutter into the work. As the cross slide completes its movement itmoves the rack I41 to the right, as viewed in Figure 12, taking up the lost motion between the lock nuts I48 threaded there- I49 so that upon continued movement the rack will rotate the pinion I50 meshing therewith. This pinion is secured to the lower end of a shaft I5I which extends upward as shown in Figure 6 into the top of the cross slide, where it has a second pinion I52 keyed thereto, as more particularly shown in Figure 8. Since the slide 29 is moving toward the right in Figure 12 itwill eiiect counterclockwise rotation of shaft I5I and thereby counterclockwise rotation of pinion I52, Figure 8. This will operate a mechanism to effect enga ment of clutch. 51 and thereby rotation of the rotary head. This-mechanism comprises a load and fire mechanism consisting of a plunger I53 which is shown in its return position in Figure 14. .In this return position a latchpawl I54 engages the end of member I55 which is relatively movable on the headed rod I56 which is secured as by a pin I5'I for movement with plunger I 53. As the plunger I53 is advanced by counterclockwise rotation of I pinion I52 a finger I58 engages the beveled end I59 of pawl I 54 to retract the same. Prior to this, however; a spring I60, which is mounted on the rod I56 between members I53 and I55, has been compressed so that when the pawl' I54 is retracted the member I 55 will be fired. Just prior to this firing a locking pawl I6I is rotated clockwise out of the path of movement of a wing I62 spring pressed detent will complete the rotation projecting radially from the detent member I63 of member I88 and through a suflicient an le so that the ball-shaped end I85 will just be out of the path of pawl I84, when the same is returned in an opposite direction. The member I88 is keyed to the end of shaft 85, which, as shown in Figure' 5, has the shifter fork 84 fixed therewith. Thus the clutch 51 is automatically engaged to cause rotation of the rotary head and thereby the formation of the annular groove.

A dog I 'II is secured to the periphery of the ro-' tary head 21 as more particularly shown in Figure 8, and up to this time, has been in engagement with a roller I12 mounted in the end of lever I13 keyed to shaft I14. This shaft has a lug I15 projecting therefrom into engagement with one end of a bell crank I18 which constantly urged by a spring I11 in a counterclockwise direction, thereby exerting a constant urge on the lever I13 in a clockwise direction. 'The shaft I14 also has fixed therewith a ball-ended lever I18 which engages a slot I19 formed in the The bell crank "8 has a lug I84 projecting therefrom which engages a slot I85 formed in the lever I38 cto preventmovement thereof in a direction corresponding to downward movement of lever II ,8 to its reverse position. This insures against inadvertent operation of lever II 8 during the 'cutting of the annular groove.

Attention is invited to the fact that when the I shaft 6,5,Fi'gure 5, was rotated clockwise to engage clutch 51 that a crank arm I88 secured to the end of shaft 65, which projects above the top of the cross slide, as shown in Figure 2, is also rotated clockwise and through a connecting link I81 rotates the manual control lever I88. This lever is secured to a shaft I89 which projects inside of the housing and has a double ended lever I98 secured thereto, more particularly shown in Figure 8. When the clutch is engaged, the

lever I98 is rotated from the position shown in Figure 14 to the position shown in Figure 8, whereby it serves to act as a locking member to prevent inadvertent rotation of the arm I48 by engagement of the ball-shaped end I9 I with a depression I92 formed in the end of lever I48. The other end I93 of lever I98 is moved into engagement with a shoulder I94 formed on theplunger I34v and thereby in a position to be actuated upon firing of the spring loaded mechanism I I5.

This mechanism is shown in detail in Figure 14 and comprises member I34 which is slidedly mounted in the bore I95 and has secured to one end, as by a pin "I98, an axially extending rod I91. This rod supports for movement relative thereto a slideable memb'er I98 which has pivot ally secured thereto a pawl I99.. This pawl is normally held in the position shown by a small leaf .spring 288 secured to the upper side thereof,

This spring'tends to cause clockwise rotation of i the pawl but-a shoulder 28I limitsits rotation to the position shown.. The endof this pawl engages a pin 282 carried in the end of lever I88. The pin 282 has portions cut away to form a small Therefore, upon shoulder-288 which e the end I98 of the pawl to cause movement of the member I98 'toward the left. These parts are in engagement when the rotary head completes its revolution and rotates the trip lever I13 in a counterclockwise direction, and thereby through lever I18 causes axial movement of rod I88. Movement of rod I88 toward the left will move the member I88- through engagement of shoulder 288 with the end of pawl I99 and cause the finger 284, projecting from the side of member I98, to engage thebevel face 285 formed on the end of latch pawl I35 to eifect retraction thereof. This movement will also compress the spring I31 so that when the lever I35 is retracted the member I34 will be fired toward the left. As this 'firing takes place, an elongated finger 288, having a shoulder 281, will engage the upturned end 288 of pawl I99 and rotate the same counterclockwise and just at the termination of the firing movement. This counterclockwise rotation will lift the end I99 of pawl I99 out of engagement with the shoulder 283, and

the spring I31 will then retract the member I 98 in spite of the fact that the pin, 282 and rod I88 remain in the position shown. This automatic retraction of member I98 permits the plunger I34 to be moved toward the right and reset later on without interference from the member 284.

It will now be seen that movement of the cross slide in a direction to sink the cutter into the work automatically causes engagement of the control clutch 51 through the load and fire mechanism shown in the upper part of Figure 14 and simultaneously through the linkage I88, I81, I88 positions the member I98 so that upon completion of a single rotation of the head 21 the clutch 51 may be automatically disengaged through tripping of the load and fire mechanism H5; and tripping of this mechanism not only disengages the clutch but rotates the detent' plate I83 back to the position shown in Figure 14, in spite of the fact that the load and fire mechanism associated therewith in this figure is still in a fired position, or in other words in the position shown in Figure 8.

Tripping of the load and fire mechanism II5 by the dog "I after completion of a single rotation of the head 21 also rotates the lever I I 8 to the position shown in Figure 14 which moves the rod I38.

toward the right and through the interconnecting mechanism previously described causes downward movement of plunger H8 and shifting of valve plunger I84 to a reverse position, or in other words, to a position causing admittance of fiuid pressure to the left hand end of cylinder 81, Figure 1. movement toward the right, the first efiect of which is to rotate the mechanism shown in Figure 10 to cause, through pinion 18 and rack 11, the retraction of the cross slide. As this cross slide retracts it again causes bodily axial movement of rack I41, Figure 12, a sufilcient amount to take up the lost motion in its connection with the fixed part of the machine and during the final part of the movement cause rotation of pinion I58 in a clockwise direction. This will cause a clockwise rotation of pinion I52, Figure 1,4,1which in turn will retract the plunger I53 9. sufiicient amount to permit the latch pawl I54 to snap into the podtion shown in Figure 14. In thisreturn move- I mentthepawl I54willsnapby the endofann I88 of detent plate I53 due to the fact that it is free' to rotate in a counterclockwise direction, but a spring pressed plunger 288 assists in returning it tothepositionshowninFigure 14 afterithas passed arm I88. Also, pawl [8| will return to'its' This results in' the slide 88 starting its As the slide 86 continues its movement a cam surface 2! 0 formed thereon will engage the end of oscillatable lever 2 connected to the end of shaft 2I2, which shaft extends interiorly of the machine and is provided with an operating lever 2l3 for withdrawing the locking plunger I42 as shown in Figure 7. Immediately after the locking plunger is withdrawn the roller l4l rotates lever 16 in a counterclockwise direction and effects, through the mechanism previously described and connected to shaft I4, retraction of the slide 30. Attention is invited to the fact that the spindle clutch H is automatically'disengaged during return movement of the cross slide by means of the following mechanism. As shown in Figures 8, 15 and 16, the slide carries a bracket 2 in which is pivotally mounted a trip pawl 215 which engages a short lever 2 l 6 keyed to shaft 2 H, which shaft carries at its upper end a lever 2 l8 connected by link 2|9 to the manually operable lever 220.

This lever is fixed to the upper end of shaft 45 which, as previously explained, in connection with Figure 4, carries the shifter fork 44, which in turn controls engagement and disengagement of the friction clutch 4|. The relationship of the return movement of the cross slide to the movement of lever 2l6 is such that the lever 2 l 6 will be rotated a suflicient amount to clear the end of lever 2| 5 and pass slightly beyond it before the cross slide stops. In other words, at the termination of the return movement of the cross slide the parts will be in the position shown in Figure 15. The purpose of this arrangement is to permit the spindle clutch to be reengaged upon rotation of lever i It by the starting lever I I8, without interference between the lever 2|6 and the trip lever 215. In other words, when the parts are actuated by the starting lever Hi) the lever 2!?) will rotate in a counterclockwise direction and engage the-side of lever 2 i 5 moving the same in a counterclockwise direction against the compression of spring 22L The parts will now be in the position shown in Figure 16. Upon initial movement of the cross slide in a direction to sink the cutter into the work, the lever 2 l 6 will pass beyond the end of lever 2 l 5, permitting the same to snap outward to the position shown in Figure 8.- This will condition the parts for tripping upon return movement of the cross slide. I

As the slide 86 completes its movement toward the left a collar. 222 secured 'to the piston rod 85, actuates through a pivoted lever 223 the by-pass valve plunger 224 to connect the line I00 to the reservoir 95, thereby stopping movement of piston 88. This valve has a port 225 which is connected through interdrllling, as shown in Figure 1'7, to port 98 of the reversing valve 89. When the plunger 224 is moved to the right against the compression of spring 229 the port 225. will be connected to the exhaust port 221.

Even although the valve plunger .224 is held in. this positionby the collar 222 it in noway interferes with restarting the machine because when the valve plunger W4 is moved to its upper position as shown in Figure 9, the port 98 is connected 'to reservoir anyway and the port 99 may be connected to pressure, causing movement of the piston 88 to the left and retraction of the collar 222 from lever 223, permitting the 'spring 226 to come into operationand close port- :25, thereby conditioning this side of the circuit for reversal so that the by-pass through this valve will be disconnected when pressure is admittedto port'98.

This mechanism forms a means for automatically stopping the machine at the e'ndof the cycle and at the same time relieves the pump 92, thereby eliminating excessive pressures building up in the system which would have to be discharged through the relief valve 96.

It should now be apparent that a complete automatic machine has been provided for the pur-' poses intended in which an hydraulic reciprocahie member controls the timing and sequence of the various positioning movements to place the cutter to depth in the work .and means trip operable upon completion of the cutting cycle to initiate retraction of the various parts in proper timed sequence by the hydraulically operable control member and means for automatically stopping the machine ,at the completion of a cycle of operation. I

It may be desired to manually control part of the cycle of operation of the machine and therefore a modified form of the invention is illustrated in Figure 13, which may be considered a semi-automatic machine. In Figure 13 the parts are shown with the cutter sunk into the work which means that the cross slide 29' is moved to its extreme position in a direction toward the top of the sheet. The lever 220', which is operatively connected, as before, through the shaft 45 for control of the spindle clutch, is in a left-hand position corresponding to engage- -ment of the spindle clutch, and therefore, the

cutter spindle is rotating. The lever I88 is operatively connected through the lever. 228 for control oi clutch 51, which determines rotation of the head 21. It will be noted that the lever I J88 has a lug 229 on the end thereof which engages a lug .238 on the end of lever 220' so a slot 232 in an interlocking rod 233, the end 01' which in the position of the parts shown enters a notch 234 formed-in the periphery of disc 235..

This disc is secured to the end of shaft l2'l' which corresponds to shaft I21 in Figure 8. This shaft is rotated. by a manual control lever H0 when the same is operated to change the direction of fluid pressure in the cylinder 81. Since the rod 233 engages the notch 234, the disc 235, and thereby the lever H0, is held against-movement during the cutting operation and serves as an interlock for that purpose. 7

The shaft I 5|, corresponding to shaft l5l of Figure 8, is rotated in the same manner and when the slide 29' moves to the position shown in Figure 13 this shaft is rotated in a counterclockwise direction, which thereby moves the lever 236 connected to the upper end thereof in a counterclockwise'direction, withdrawing the end of the lever from the pathof movement of rod 231 connected for movement as by a pin 238 with lever I88. The lever 236 serves as an interlock to prevent counterclockwise rotation of lever I88 to the position shown until the-cross slide 29' has completed its cross movement. In other that in the position of the parts the spindle clutch head 21 a dog 23! can'ied thereby rotates shaft 240 through a star wheel 2", shown in Figure 19, and a cam wheel 242 having aseries of V- shaped projections 243 adjacent the rim thereof for shifting lever 228. The lever has a slide 244 'reciprocably mounted therein which has a V- of spring 246 a predetermined amount until it shaped lug 245 projecting from the side'thereof for engagement by one of the projections 24} so that upon movement of the wheel 242 the slide is moved forward against the compression hits a solid part of the lever when a camming action follows, shifting the lever 22. toward the right a sufilcient amount to cause the springpressed detent 244 to pass over the peak 249 intermediate the'indents 25. and 25l, whereby the detent 248 will complete the shifting movement and disengage clutch i1.-

Oompletion of this shifting movement will move the lug 243 on the slide 245 a sufil'cient amount to permit the spring 246 to return the slide a sufllcient amount so that the clutch may be reengaged without interference with the projecting lugs on the side of wheel 242.

Simultaneously with the actuation of the star wheel by dog 23! a bell crank 252 is rotated by engagement of a lug 2'3 carried by the worm wheel 83 with the end of lever 254. The bell crank 252 has a ball-ended lever 255 engaging a slot in the side of locking plunger 256' for withdrawing the same from a second notch 251' formed in the wheel 235..

Rotation of the rotary head 21 has now ceased andthecontrolparts areinsucha positionthat the lever 22. may be rotated to disengage spindle clutch 4| and correspondingly stop rotation of the cutter spindle, and the plungers 233 and 256 have been withdrawn so that shaft I21 is 'free to rotate, whereby the lever ll. may be operatedtoreverse thepressurein the hydraulic cylinder and cause,--first, retraction of slide 29' and subsequently retraction of the main slide 44. Retraction of slide '29 will replace the lever 23' to preventsubsequent engagement of clutch 51 untilthe cutter has been repositioned in en-.

easement with the work.

There has thus been provided an improv mechanism for performing the complicated milling operations indicated, and which is simple to construct and operate and which has suitable interlocks to insure that the various movements are eifected in the proper sequence.

. I claim:

1. In a machinetool having a work support and a tool support,"the combination of means for eifecting relative movement between the supports in a first direction, an adjustable positive step for limiting said movement, automatically actuable means for locking the support in said position, and additional means for effecting relative movement between said supports in an angular-directionwithrespectto said first direction, and a common fluid operable member for sponsive to completion of said orbital movement for automatically disengaging said clutch.

3. In a milling machine having a work support, the combination of a first slide, movable toward and from the work support, a cross slide supported by said first slide, a cutter spindle and cutter joumaled in said cross slide, power operable means for eflfecting bodily orbital movement of the cutter spindle in the cross slide including a control clutch, fluid operable means for moving the cross slide in a direction to cause engagement between the cutter and work, and

means trip actuable from movement of the cross slide for engaging said clutch.

4. In a milling machine'having a work support, the combination of a first slide movable toward and from the work support, a cross slide supported by said first slide,a cutter spindle and cutter journaled in said cross slide, power operable means for effecting bodily orbital movement of the cutter spindle in the cross slide including a control clutch, fluid operable means for moving the cross slide in a direction to cause engagement between'the cutter and work, and trip mechanism operatively connected for actuation by the cross slide for effecting en'gagement of said clutch, said operative connection including lost motion means whereby actuation of said trip mechanism will occur at the end of z the cross slide movement.

5. In a milling machine having a work support, the combination of a first slide movable toward and from the work support, a cross slide supported by;said first slide, a cutter spindle and cutter journaled in said cross slide, power operable means foreflecting bodily orbital movement of the cutter spindle in the cross slide including a. control clutch, fluid operable means for moving the cross slide in a direction to cause engagement between the cutter and work, and load and fire mechanism 'for eifecting engagement of said clutch including an operating member, lost mo-.

tlon connections between said member and the cross slide whereby at the end of one extreme movement of the cross slide the mechanism will be loaded and fired and at the-other extreme movement of the cross slide the operating memher will be returned to recondition the mecha- 6. In a machine for milling internal grooves the combination of a movable slide, a cutter spindle eccentrically jou'maled in the slide, means to move the slide to effect engagement between a cutter carried by the spindle and a work piece, power operable transmission means for effect- 1 ing orbital movement of the cutter spindle including a control clutch, a first load and fire mechanism operable by the slide for eflectins' g engagement of said clutch, and a second load and flre mechanism trip actuable by the orbital movement of the cutter spindle to eifect disen- E sement of said clutch. r Y

'I. A milling' machine having a worksupport,

a first slide movable toward and from the work support, a rack and gear mechanism for eflecting said movement, a cross slide movable transversely of the first slide; a rack and gear mechanism for reciprocatingthe cross slide,- a spindle carrieriournaled in the cross slide, a cutter spindie and cutter journaled in the carrier eccentrically thereof, power operable means formtating the spindle and carrier including a separate clutcharranged in serial power transmitting relationship, a fluid operable member for actuating said mechanisms, asource of. presposition and simultaneously engaging the spindle control clutch and means actuable by advance of said member for sequentially operating said mechanisms and theirrespective slides to engage the cutter with the work.

8. A milling machine having aawork support, a first slide movable toward and from the work sup-' port, a rack andgear mechanism for effecting said movement, a cross slide movable transversely of the first slide, a rack and gear mechanism for reciprocating the cross slide, a spindle carrier journaled in the .cross slide, a cutter spindle and cutter journaled in the carrier eccentric'ally thereof power operable means for rotating the spindle and carrier including a separate clutch arranged in serial power transmitting relationship, a fluid operable member for actuating said mechanisms,

a source of pressure including a reversing valve, a manual control lever for shifting said valve to a starting position and simultaneously engaging the spindle control clutch, means actuable by advance of said member for sequentially operatin said mechanisms and their respective slides to engage the cutter with the work, and means operable by the cross slide to engage the spindle 'carrier clutch to cause planetary movement of the cutter spindle.

9. A milling machine having a work support, a first slide movable toward and from the work support, a rack and gear mechanism for efi'ecting said movement, a cross slide movable transversely of the first slide,'a rack and gear mechanism for reciprocating thecro'ss slide, a spindle carrier journaled in the cross slide, a cutter spindle and cutter journaled in the carrier eccentrically there- ,of power operable means for rotating the spindle and carrier including a separate-clutch arranged in serial power transmitting relationship, a fluid operable member for actuating said mechanisms, a source of pressure including a reversing valve, a manual control lever for shifting said valve to a starting position and simultaneously engaging the spindle control clutch, means actuable by advance of said member for sequentially operating said mechanisms and their respective slides to engage the cutter with the work, means operable by r the cross slide to engage the spindle carrier clutch to cause planetary movement of the cutter spine die, and means trip operable by the carrier for disengaging its own clutch and simultaneously shifting the reverse valve to cause return movement of said fluid operable member and thereby through said mechanisms to return said slides.

10. A milling machine having a work support, a first slide movable toward and from the work support, a rack and gear mechanism foneflecting said movement, a cross slide movable transversely of the first slide, a rack and gear mechanism for reciprocating the cross slide, a spindle carrier journaled in the cross slide, a cutter spindle and cutter journaled in the carrier eccentrically' thereof, power operable means for rotating the spindle and carrier including a separate clutch arranged in serial power transmitting relationship, a fiuid operable member foractuating said mechanisms, a source of pressure including a reversing "valve, a-manual control lever for shifting said valve to a starting position and simultaneously engaging the spindle control clutch, means actuable by advance of said member for sequentially operating said mechanisms and their respective slides to engage the'cutter with the work,

'means operable by the cross slide to engage the spindle carrier clutch to cause planetary move- 'ment of the cutter spindle, means trip operable by the carrier for disengaging its own clutch and simultaneously shifting the reverse valveto cause return movement of said fluid operable member and thereby through said mechanisms to return said slides, and means responsive to return movement of the cross slide to disengage the spindle clutch.

11. A milling machine having a work support, a first slide movable toward and from the work support, a rack and gear mechanism for eiiecting said movement, a cross slide movable transversely of the first slide, a rack and gear mechanism for reciprocating the cross slide, a spindle carrier journaled in the cross slide, a cutter spindle and cutter journaled in the carrier eccentrically thereof, power operable means for rotating the spindle and carrier including a separate clutch arranged in dle, means trip operable by the carrier for disengaging its own clutch and simultaneously shifting the reverse valve to cause return movement of said fluid operable member and thereby through said mechanisms to return said slides, means responsive to return movement of the cross slide to disengage the spindle clutch, and a by-pass valve operable by said member for by-passing said pump to reservoir and thereby stopping the machine.

12. A milling machine having a work support, a

first slide movable toward and from the work support, a rack and gear mechanism for effecting said movement, a cross slide movable transversely of the first slide, a rack and gear mechanism for reciprocating the cross slide, a spindle carrier journaled in the cross slide, a cutter spindle and cutter journaled in the carrier eccentrically thereof, power operable means for rotating the spindle and carrier including a separate clutch arranged in serial power transmitting relationship, a fluid operable member for actuating said I mechanisms, a source of pressure including a reversing valve, a manual control lever for shifting said valve to a starting position and simultarieously engaging the spindle control clutch, means actuable by advance of said member for sequentially operating said mechanisms and their respective slides toengage the cutter with the work, means trip operable by the cross slide to engage the clutch for the carrier to causeplanetary movement of the cutter spindle, and means responsive to initiation of rotation of the carrier to lock said reversing valve so that the slides cannot be moved during planetary movement of the cutter. 1

13. A milling machine having a work support, a first slide movable toward and from the work support, a rack and gear mechanism for'efiecting said movement, a cross slidemovable' transversely of -the first slide, a rack and gear mechanism for reciprocating the cross slide, a spindle carrier joumaled in the cross slide, a cutter spindle and cutter journaled in the carrier eccentrically thereof, power operable means for rotating 8 r V accuse the spindle and carrier including a separate clutcharranged in serial power transmitting relationship, a fluid operable member for actuating said mechanisms, a source of pressure including a reversing valve, a manual control lever for shitting said valve to a startingbposition and simultaneously engaging the spindle control clutch,

14. A milling machine having a work support, a first slide movable toward and from the work 1 support, a second slide reciprocably mounted upon the first slide, mechanisms individual to the respective slides for reciprocating the same,

.a spindle carrier joum-aled in one oi. said slides,

a cutter spindle and a cutter journaled in the carrier eccentri'cally thereoii, a power transmission including a prime mover mounted in the slide supporting the carrier, said transmission including control clutches for determining rotation respectively of the spindle and the carrier, individual manually operable means for the re-: spective clutches and interlocking means between said manually operable means for preventing engagement of the control clutch for the carrier until the spindle clutch 'hasbeenengaged.

15. A milling machine having a work support,

a first slide movable toward and from the work support, a second slide reciprocably mounted upon the first slide, mechanisms individual to the respective slides'ior reciprocating the same, a spindle carrier joumaled in one of said slides, a cutter spindle and a cutter journaled in the carrier eccentrically thereof, a. power transmission including a prime mover mounted in the slide supporting the carrier said transmission including control clutches for'determining rotation respectively or the spindle and the carrier, individualmanually operable means for the respective clutches, interlocking means between said manuallyoperabie means for preventing engagement of the controlclutch for the carrier until the spindle clutch has been engaged, and means to prevent engagement of the spindle carrier control clutch until the slide upon which the carrier is mounted has been moved to its extremeposition.

16. A milling machine having a work support, a first slide movable toward and from the work support, a second slide "reciprocably mounted upon the first slide, mechanisms individual to the respective slides for reciprocating the same, a spindle carrier iournaled in one or said slides,

a cutter spindle anda'cutter journaled in'the carrier eccentrically thereof, a power transmission including a prime mover mounted inthe slide supporting the carrier, said transmission including control clutches for determining rotation respectively or the spindle and the carrier,

individual manually operable means for the respective clutches, interlocking means between said manually operable means tor preventing en gagement ot the control clutch for the carrier until the spindle clutch has been engaged, and

interlocking means for maintaining the spindle clutch engaged duringrotation or the carrier. ERWIN G. ROliiH'MI 

